www.howstuffworks.com
You can find a cutaway picture of a gumball machine on the internet
Try Googling: free animated GIFs.
One can find images of animated stars on websites such as Scri8e, Animation Library or Net Animations. Another website where one can find animated stars is Photobucket.
photobucket.com is a great website to find animated backgrounds!
A good place to find animated GIFS is the website forgifs. Heathers Animations is another good source for animated GIFS as is Animation Factory and AnimatedGif.
yolo.com
Depends on the car, inline engines can range in size from 2 cylinders to 8 and higher. You will not likely find any car with an inline 8 engine though, because it is too long. The most common are the straight-four, straight-five, and straight-six.
eBay or gamestores
http://bestanimations.com/
One can find animated hearts online from many different resources. One may use the google image resource for animated hearts. One may also visit websites that specialize in animation.
Animated flower pictures can be found at GIF sites, as well as forums and discussion boards that post animated pictures. There are add on features with some browsers that allow animated pictures as well.
You can find old animated movies at most local library branches. You can also find them at some pawn shops, at some toy stores that sell memorabilia, and even online.